<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    
</head>

<body>

    <style>
        

        .flow-item {
            float: left;
            width: 16.66667%;
            max-width: 180px;
            text-align: center;
            margin-bottom: 9px;
            padding-right: 2px;
        }

        .flow-item>div {
            position: relative;
            padding: 5px 0 5px 12px;
            line-height: 20px;
            background: #90A4AE;
            white-space: nowrap;
            overflow: visible;
            color: #fff;
        }

        .flow-item>div:before,
        .flow-item>div:after {
            content: ' ';
            display: block;
            width: 0;
            height: 0;
            border-style: solid;
            border-width: 15px 0 15px 15px;
            border-color: transparent transparent transparent #90A4AE;
            position: absolute;
            left: 0;
            top: 0
        }      
        .flow-item>div:before {
            border-left-color: #fff;
            z-index: 1
        }

        .flow-item>div:after {
            left: auto;
            right: -14px;
            z-index: 2
        }

        .flow-item-0>div:before {
            display: none
        }

        .flow-item-1>div {
            background: #1976D2
        }

        .flow-item-1>div:after {
            border-left-color: #1976D2
        }

        .flow-item-2>div {
            background: #4CAF50
        }

        .flow-item-2>div:after {
            border-left-color: #4CAF50
        }

        .flow-item-1>div:hover {
            background: #1565C0
        }

        .flow-item-1>div:hover:after {
            border-left-color: #1565C0
        }

        .flow-item-2>div:hover {
            background: #43A047
        }

        .flow-item-2>div:hover:after {
            border-left-color: #43A047
        }

    </style>
    <div class="flow-item flow-item-0">
        <div>主页</div>
    </div>
    <div class="flow-item flow-item-1">
        <div>导航一</div>
    </div>
    <div class="flow-item flow-item-2">
        <div>导航二</div>
    </div>
    


</body>
<script>
</script>

</html>